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-- File: Circ2dTanCen.cdl
-- Created: Mon Mar 18 16:08:05 1991
-- Author: Remi GILET
-- <reg@topsn3>
---Copyright: Matra Datavision 1991
class Circ2dTanCen
from GccAna
---Purpose: This class implements the algorithms used to
-- create 2d circles tangent to an entity and
-- centered on a point.
-- The arguments of all construction methods are :
-- - The qualified element for the tangency constrains
-- (QualifiedCirc, Line, Point).
-- - The center point Pcenter.
-- - A real Tolerance.
-- Tolerance is only used in the limits cases.
-- For example :
-- We want to create a circle tangent to an EnclosedCirc C1
-- with a tolerance Tolerance.
-- If we did not used Tolerance it is impossible to
-- find a solution in the the following case : Pcenter is
-- outside C1.
-- With Tolerance we will give a solution if the distance
-- between C1 and Pcenter is lower than or equal Tolerance.
uses Pnt2d from gp,
Lin2d from gp,
Circ2d from gp,
QualifiedCirc from GccEnt,
Array1OfReal from TColStd,
Array1OfInteger from TColStd,
Array1OfCirc2d from TColgp,
Array1OfPnt2d from TColgp,
Position from GccEnt,
Array1OfPosition from GccEnt
raises NegativeValue from Standard,
OutOfRange from Standard,
NotDone from StdFail,
BadQualifier from GccEnt
is
Create( Qualified1 : QualifiedCirc from GccEnt ;
Pcenter : Pnt2d from gp ;
Tolerance : Real from Standard) returns Circ2dTanCen
---Purpose: This method implements the algorithms used to
-- create 2d circles tangent to a circle and
-- centered on a point.
raises BadQualifier from GccEnt;
Create( Linetan : Lin2d from gp ;
Pcenter : Pnt2d from gp ) returns Circ2dTanCen;
---Purpose: This method implements the algorithms used to
-- create 2d circles tangent to a line and
-- centered on a point.
Create( Point1 : Pnt2d from gp ;
Pcenter : Pnt2d from gp ) returns Circ2dTanCen;
---Purpose: This method implements the algorithms used to
-- create 2d circles passing thrue a point and
-- centered on a point.
-- Tolerance is a tolerance criterion used by the algorithm
-- to find a solution when, mathematically, the problem
-- posed does not have a solution, but where there is
-- numeric uncertainty attached to the arguments.
-- In these algorithms Tolerance is only used in very
-- specific cases where the center of the solution is very
-- close to the circle to which it is tangential, and where the
-- solution is therefore a very small circle.
-- Exceptions
-- GccEnt_BadQualifier if a qualifier is inconsistent with
-- the argument it qualifies (for example, enclosing for a line).
IsDone(me) returns Boolean from Standard
is static;
---Purpose: This method returns True if the construction
-- algorithm succeeded.
-- Note: IsDone protects against a failure arising from a
-- more internal intersection algorithm, which has reached
-- its numeric limits.
NbSolutions(me) returns Integer from Standard
---Purpose: Returns the number of circles, representing solutions
-- computed by this algorithm and raises NotDone
-- exception if the algorithm didn't succeed.
raises NotDone
is static;
ThisSolution(me ;
Index : Integer from Standard ) returns Circ2d from gp
---Purpose: Returns the circle, representing the solution number Index and raises OutOfRange
-- exception if Index is greater than the number of solutions.
-- Be carefull: the Index is only a way to get all the
-- solutions, but is not associated to theses outside the
-- context of the algorithm-object.
-- Raises NotDone if the construction algorithm didn't succeed.
-- It raises OutOfRange if Index is greater than the
-- number of solutions or less than zer
raises OutOfRange, NotDone
is static;
WhichQualifier(me ;
Index : Integer from Standard;
Qualif1 : out Position from GccEnt )
raises OutOfRange, NotDone
is static;
---Purpose: Returns the qualifier Qualif1 of the tangency argument
-- for the solution of index Index computed by this algorithm.
-- The returned qualifier is:
-- - that specified at the start of construction when the
-- solutions are defined as enclosed, enclosing or
-- It returns the real qualifiers (the qualifiers given to the
-- constructor method in case of enclosed, enclosing and outside
-- and the qualifiers computedin case of unqualified).
Tangency1(me ;
Index : Integer from Standard;
ParSol : out Real from Standard;
ParArg : out Real from Standard;
PntSol : out Pnt2d from gp )
---Purpose: Returns informations about the tangency point between the
-- result number Index and the first argument.
-- ParSol is the intrinsic parameter of the point PntSol
-- on the solution curv.
-- ParArg is the intrinsic parameter of the point PntArg
-- on the argument curv.
raises OutOfRange, NotDone
is static;
---Purpose: It raises NotDone if the construction algorithm
-- didn't succeed.
-- It raises OutOfRange if Index is greater than the
-- number of solutions or less than zero.
IsTheSame1(me ;
Index : Integer from Standard ) returns Boolean from Standard
---Purpose: Returns True if the solution number Index is equal to
-- the first argument.
raises OutOfRange, NotDone
is static;
---Purpose: It raises NotDone if the construction algorithm
-- didn't succeed.
-- It raises OutOfRange if Index is greater than the
-- number of solutions or less than zero.
fields
WellDone : Boolean from Standard;
-- True if the algorithm succeeded.
NbrSol : Integer from Standard;
-- The number of possible solutions. We have to decide about the
-- status of the multiple solutions...
cirsol : Array1OfCirc2d from TColgp;
---Purpose : The solutions.
qualifier1 : Array1OfPosition from GccEnt;
-- The qualifiers of the first argument.
TheSame1 : Array1OfInteger from TColStd;
-- 1 if the solution and the first argument are the same (2 circles).
-- if R1 is the radius of the first argument and Rsol the radius
-- of the solution and dist the distance between the two centers,
-- we concider the two circles are identical if R1+dist-Rsol is
-- less than Tolerance.
-- 0 in the other cases.
pnttg1sol : Array1OfPnt2d from TColgp;
-- The tangency point between the solution and the first argument on
-- the solution.
par1sol : Array1OfReal from TColStd;
-- The parameter of the tangency point between the solution and the
-- first argument on the solution.
pararg1 : Array1OfReal from TColStd;
-- The parameter of the tangency point between the solution and the first
-- argument on the first argument.
end Circ2dTanCen;
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